package com.itheima.web.request;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedReader;
import java.io.IOException;

@WebServlet("/req1")
public class RequestDemo1 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // String getMethod(): 获取请求方式：GET
        String method = req.getMethod();
        System.out.println(method);

        // String getContextPath(): 获取虚拟目录（）项目访问路径: /request-demo
        String contextPath = req.getContextPath();
        System.out.println(contextPath);

        // StringBuffer getRequestURL(): 获取URL（统一资源定位符）：http://localhost:8080/request-demo/req1
        StringBuffer url = req.getRequestURL();
        System.out.println(url.toString());

        // String getRequestURI(): 获取URI（统一资源标识符）：/request-demo/req1
        String uri = req.getRequestURI();
        System.out.println(uri);

        // String getQueryString(): 获取请求参数（GET方式）： username=zhangsan&password=123456
        String queryString = req.getQueryString();
        System.out.println(queryString);


        // ---------------
        // 获取请求头： user-agent: 浏览的版本信息
        String agent = req.getHeader("user-agent");
        System.out.println(agent);

    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // 获取post 请求体：请求参数

        // 1. 获取字节输入流
        BufferedReader br = req.getReader();
        // 2. 读取数据
        String line = br.readLine();
        System.out.println(line);
    }
}
